Formula: (Na,K)CaAl6(PO4)4(OH)9 . 3H2O
Origin of name: For F. Millis, American mineral collector
Crystal system: Tetragonal
Crystal class: Unknown
Twinning:
Unit cell: a = 7.00 Å, c = 19.07 Å
Colour: White, light gray, greenish
Diaphaneity:
Luster:
Habit: Chalcedonic crusts; spherules, finely fibrous
Hardness: 5.5
Specific gravity: 2.83
Cleavage: 1; {001}
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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